avcodec/aac_ac3_parser: Use ff_adts_header_parse_buf()

instead of avpriv_adts_header_parse(). Using the former avoids
an indirection.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/aac_ac3_parser.c

@@ -144,10 +144,9 @@ get_next:
 #endif
         } else {
 #if CONFIG_AAC_PARSER
-            AACADTSHeaderInfo hdr, *phrd = &hdr;
-            int ret = avpriv_adts_header_parse(&phrd, buf, buf_size);
-
-            if (ret < 0)
+            AACADTSHeaderInfo hdr;
+            if (buf_size < AV_AAC_ADTS_HEADER_SIZE ||
+                ff_adts_header_parse_buf(buf, &hdr) < 0)
                 return i;
 
             bit_rate = hdr.bit_rate;